#!/bin/sh

# Copyright 2012 Edward W. Koenig, Vancouver, WA, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# nvidia-switch utility 2.0.0
#
# A tool to install and cleanly remove the nvidia driver without stomping on the xorg files.
# Note: this tool no longer supports switching drivers "on the fly" only installing and uninstalling
# the nvidia driver and restoring the original xorg files. 

# TO-DO: Bounds/error checking, add COMPAT32 

set -e

ROOT="/"
CWD=$(pwd)
LIBSUFFIX="LIBDIRSUFFIX" # This will be replaced in the build script
INC="${ROOT}usr/include/GL"
LIB="${ROOT}usr/lib${LIBSUFFIX}"
XMOD="${LIB}/xorg/modules"
XLIB="$XMOD/extensions"
NV_VERSION='PKGVERSION' # This will be replaced in the build script
GL_VERSION="1.2"
NV_CONF="/usr/share/X11/xorg.conf.d/10-nvidia.conf"

# Move, rename, restore files in /usr/include/GL
incs(){
cd "$INC"
if [ "$1" = "xorg" ]; then
   for i in glxext.h glext.h glx.h gl.h; do
	rm -f "$i"
	mv "$i-xorg" "$i"
   done
else
    for i in glxext.h glext.h glx.h gl.h; do
        if [ ! -e "$i-xorg" ]; then
	    mv "$i" "$i-xorg"
	fi
	ln -sf "$i-nvidia" "$i"
    done
fi
cd "$CWD"
}

save_GL(){
  cd "$LIB"
  if [ "$1" = "nvidia" ]; then
	if [ ! -e libGL.so.$GL_VERSION-xorg ]; then
	    mv libGL.so.$GL_VERSION libGL.so.$GL_VERSION-xorg
	fi
	ln -sf libGL.so.$NV_VERSION-nvidia libGL.so.$NV_VERSION
	ln -sf libGL.so.$NV_VERSION libGL.so.1
	ln -sf libGL.so.1 libGL.so
  elif [ "$1" = "xorg" ]; then
	mv libGL.so.$GL_VERSION-xorg libGL.so.$GL_VERSION 
	ln -sf libGL.so.$GL_VERSION  libGL.so.1
	ln -sf libGL.so.1 libGL.so
        rm -f libGL.so.$NV_VERSION
  fi 
cd "$CWD"
}

save_wfb(){
  cd "$XMOD"
  if [ "$1" = "nvidia" ]; then
	ln -sf libnvidia-wfb.so.$NV_VERSION-nvidia libnvidia-wfb.so.$NV_VERSION
	ln -sf libnvidia-wfb.so.$NV_VERSION libnvidia-wfb.so.1
	if [ ! -e libwfb.so ]; then
            ln -sf libnvidia-wfb.so.$NV_VERSION libwfb.so
        fi
  elif [ "$1" = "xorg" ]; then
	rm -f libnvidia-wfb.so.$NV_VERSION
	rm -f libnvidia-wfb.so.1
        if [ -L libwfb.so ]; then
	    rm -f libwfb.so
        fi
  fi 
cd "$CWD"
}

save_glx(){
  cd "$XLIB"
  if [ "$1" = "nvidia" ]; then
	if [ ! -e libglx.so-xorg ]; then
	    mv libglx.la libglx.la-xorg
	    mv libglx.so libglx.so-xorg
	fi
	ln -sf libglx.so.$NV_VERSION-nvidia libglx.so.$NV_VERSION
	ln -sf libglx.so.$NV_VERSION libglx.so
  elif [ "$1" = "xorg" ]; then
	rm -f libglx.so.$NV_VERSION
	rm -f libglx.so
	mv libglx.so-xorg libglx.so
	mv libglx.la-xorg libglx.la
  fi 
cd "$CWD"
}

nvidia_ldconfig(){
   /sbin/ldconfig
   #Generate correct symink for that lib
   /sbin/ldconfig -l $1
}

nvidia_install(){
  echo $'Installing to nvidia-driver files!\n'
  echo "Make sure the nvidia driver is ENABLED in /etc/X11/xorg.conf."
  echo "Otherwise, this may lead to improperly working drivers."

  incs
  save_GL "nvidia"
  save_wfb "nvidia"
  save_glx "nvidia"

  LD_NVIDIA="${LIB}/libGL.so.$NV_VERSION-nvidia"
  nvidia_ldconfig $LD_NVIDIA
}

nvidia_remove(){
  echo $'Returning to stock xorg files!\n'
  echo "Make sure the nvidia driver is DISABLED in /etc/X11/xorg.conf"
  echo "and in /etc/X11/xorg.conf.d."
  echo "Otherwise, this may lead to improperly working drivers."

  incs "xorg"
  save_GL "xorg"
  save_wfb "xorg"
  save_glx "xorg"

  if [ -e $NV_CONF ]; then
	rm -f $NV_CONF
  fi
  
  LD_NVIDIA="${LIB}/libGL.so.1.2"
  nvidia_ldconfig $LD_NVIDIA
}

usage(){
  echo "Usage:"
  echo " --install		Set up nvidia driver files"
  echo " --remove		Return to stock xorg files and remove all symlinks"
  echo " --help			Show this help message"
}

if [ "$1" = '--install' ]; then
  ROOT="/"
  CWD=$(pwd)
  if [ -e "${ROOT}usr/lib64" ]; then
    LIBSUFFIX="64"
  else
    LIBSUFFIX=""
  fi
  INC="${ROOT}usr/include/GL"
  LIB="${ROOT}usr/lib${LIBSUFFIX}"
  XMOD="${LIB}/xorg/modules"
  XLIB="$XMOD/extensions"
  nvidia_install
elif [ "$1" = '--remove' ]; then
  nvidia_remove
elif [ "$1" = '--help' ]; then
  usage
else
  usage
fi
